Combination burner



March 14, 1944, J. A. CREIGHTON COMBINATION BURNER Filed July 12, 1940 2 Sheets--Sheeil 1 NNl gwwhtoz Jaimes d. fr? JL.

March 14, 1944. J, A, CREIGHTON COMBINATION BURNER Filed July l2, 1940 2 Sheets-Sheet 2 Patented Mar. i944 COMBINATION BURNER E James A. Creighton, Hamburg, N. Y., assigner to Bethlehem Steel Company, a corporation of Pennsylvania Application July 12, 1940, Serial No. 345,092

2 Claims. ('Cl. 158-73) This invention relates to combination burners for introducing liquid and gaseous fuels into furnaces, and relates more particularly to burners for introducing fuels into high-temperature furnaces, such as open-hearth furnaces used in the production of steel, and also other hightemperature furnaces, in which it is necessary to provide wateror other liquid-cooled Jackets through which the fuel pipes are introduced into the heating or melting chambers.

Heretofore when burners have been used for heating furnaces of this type, it has been the usual practice to have a burner with a single jet at each end of the furnace employing one, or an appropriate combination, of various gas and liquid fuels. My invention differs from the conventional burner in that there are two oil or liquid fuel injection pipes, one located on either side of a combination gas and oil or liquid fuel pipe, allV enclosed in a common water-cooled jacket, and the entire burner is located in the furnace in a fiat position with-all the fuel pipcs'on the same horizontal eener.; line. I also introduce steam into the burner around each of the oil or liquid fuel injection pipes, whereb combustion is greatly stimulated and a mu h more intense heat is produced.

Another advantage of a burner of this type is that such a burner gives a better flexibility for the distribution of flame across the hearth of the furnace; lowers the flame with relation to the roof; provides more complete atomization of fuel; and the general operation of the furnaces equipped with .this style burner is greatly improved in numerous respects.

Other objects of my invention will hereinafter ppear. Y

Having thus given a general description of the advantages of my invention, I will now in order to make the same more clear, refer to the of this specification and in which like characters through the upper portion of an open-hearth vannexed tw'o sheets of drawings forming a part furnace showing a burner at each end o! the Figure 5 with the pipe'connections shown in elevation;

Figure 4 is a vertical longitudinal section taken on the line I-I of Figure 5; and

Figure 5 is a vertical transverse section taken on the line 5-5 of Figure 4.

Referring now to-the various characters of reference on the drawings, the numeral I designates the upper portion of a regenerative basic open-hearth steel furnace, 2 its roof, 3 the hearth. and 4 the bath. Each end of the furnace is provided with the usual air uptakes li communicating with the regenerators (not shown) through which the heated air is received for the burner in operation or the waste gases are discharged from the combustion chamber. An opening 8 is formed in each end of the furnace for the reception of ay burner I which preferably has a hood 8 of refractory material extending over the burner.

As each of these burners is of the same construction a description of one will apply to both.

The burner has an outer casing 9 formed of a standard pipe which is flattened to form an oval tubular shaped member as indicated in Figure 5, and closed at the front and rear ends by means of plates I0 and II, respectively, to form a water- Jacket for the circulation of cooling water which is supplied through the forwardly projecting water inlet pipe I2 feeding into the transverse pipe I2a welded thereto. Each end of said transverse pipe I2a is closed by welded round plate I2b, and is supported on the oval sides of the water-Jacket near the front end and slightlyv above the bottom on a horizontal plane. Weld- -ed to said transverse pipe I2a are three forwardlyA projecting nipples or nozzles I2c, one y being directly beneath each one of the subse quently described burner tubes I4, 25 and 28 for individually cooling ean tube. The warm 'watergjacket in parallel relation to the side wall is a large central tube I4 which extends through the end plates Ill and II and is welded thereto. The rear end of the tube I4 extends beyond the rear end plate II and is threaded to receive a Tfltting I 5 which is coupled to receive a cokeoven or fuel gas supply pipe I6 and a reducerntting I'I, which last is also threaded to receive T-fitting I8. T-ntting I8 in turn is coupled to steam inlet pipe I9 and threaded to receive a stuillng box 20 adapted to support the rear end of oil burner pipe 2l. Said oil burner pipe 2| extends through the gas and steam pipe I4, being supported centrally therein near the front end by means oi spider 22, and also extends through the stumng-box 20 to couple through an L-fitting 23 to an oil supply pipe 24.

Parallel to and on the same horizontal plane with the central tube I4, but separate from and on opposite sides thereofl are tubes 25 and 26,

which also extend through the end plates Il! and I I and are welded thereto. The rear ends oi said tubes 25 and 26 likewise extend beyond the rear end plate Il and are threaded to receive couplings 21 and 28, which in turn are threaded t receive nipples 29 and 30. Said nipples are coupled to T-iittings 3l and 32, which couple to steam inlet pipes 33 and'34. T-iittings 3l and 32 are provided with stuilingboxes 35 and 36, respectively, which support the rear ends of oil burner pipes 31 and 38. These oil burner pipes 31 and 38 extend centrally through the tubes 25 and 26, and their rear ends extend through the stalling-boxes 35 and 36 and are threaded for L-flttings 39 and 40, which couple to oil supply pipes 4| and 42. The said inner oil burner pipes 31 and 38 are held centrally within the tubes 25 and 28 by means of spiders 43 and 44.

For illustration, I have described my invention as a combinatibn oil, steam and gas burner particularly adapted for use in an open-hearth furnace, but I wish it understood that it may be used with other kinds oi' furnaces equally as well, and that tar or other liquid fuel may be substituted for oil if desired.

Although I have shown and described this in Ventron m considerable detail, I do not Wish tc be limited strictly to the exact and speciiic details shown and described, but may use such substitutions, modifications or equivalents thereof as are embraced within the scope of the inven tion or as pointed out in the claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A burner unit for a regenerative open hearth steel furnace, comprising a. plurality of tubes arranged horizontally in parallel alignment to each other, means for supplying steam to the tubes, a smaller liquid fuel pipe extending through each of said tubes and secured therein, means for supplying liquid iuel to said smaller pipes, an oval outer casing surrounding the tubes, end plates welded to iront and rear ends ci said tubes and outer casing, a forwardly extending T-shaped water inlet pipe in the bottom part of the outer casing, a plurality of nipples projecting from the transverse pipe and directed toward the front end plate, means for supplying cooling water through the water inlet pipe and nipples, and means for discharging the spent water. l

2. A burner unit for a regenerative open hearth steel furnace, comprising a pair of tubes arranged horizontally in parallel relation to each other at opposite sides of the burner unit, a tube of larger diameter disposed centrally of the burner unit in evenly spaced parallel alignment between said pair of tubes, a liquid fuel burner pipe mountedin each of the tubes, means for supplying liquid-fuel to `each liquid fuel burner pipe, means for injecting steam into each of the tubes around the liquid fuel burner pipes, means for introducing gas into the scentral tube for mixing with the steam therein, an oval outer casing forming a Watan-.jacket surrounding the tubes, an end plate secured-at each end of the casing supporting an end of each tube, a forwardly projecting water inlet pipe welded to the rear end plate, means for supplying water uto the water inlet pipe, a transverse horizontal pipe with closed ends welded to said water inlet pipe, a nipple projecting from said transverse pipe directly beneath each tube for cooling the tube, and an outlet pipe for discharging spent water from the water-Jacket.

JAMES A. CREIGHION. 

